1918.] The Fifth Indian Science Congress. elxxv 
us with a catalogue of all the oil-seepages which were known 
s in so many other oil regions, surface shows alone are entirely 
unreliable as indications of workable oil beneath thé surface. 
Stratigraphy. 
In examining any new region for oil the prospector ~ 
two main objects in view :— 
1. To establish the stratigraphic horizons, shame 
which oil is likely to occur in commercial quantities. 
2. To find large anticlinal or dome structures in which the 
Sees horizons will occur within reach of the 
rill, 
Frequently the two problems present themselves simul- 
taneously, for oil-seepages often occur on structures which ws 
h able to the occurrence of oil in quantity. In the Punja : 
ist ade all the known s es were on structures which were 
istinetly unfavourable or too doubtful to be recommend for 
th Ing. From the known seepages we were able to aphrerZ 
‘ e oil-bearing horizons and the search for favourable struc 
ares came later. 
© succession of tertiary rocks i 
Punjab is as follows :— . : 
Upper Siwalik. 
Middle Siwalik. 
n the northwest 
1 Rec, Geol. Sur. Ind., Vol. x, ps 107 (1877) 
